The main economic traits of the three-way hybrid lean hog are fast weight gain, high lean meat percentage, excellent meat quality, and good feed compensation. Compared with binary hybrid pigs, the daily gain increased by 16.8% and the feed conversion rate increased by 3.47%. The lean meat ratio increased by 7.52% (Zhang Jiansheng, 1997)*, which is a hot spot for domestic and foreign markets. At present, Sanyuan pigs have developed rapidly and the amount of breeding has increased significantly. Our country has a vast territory, and the basis for pig rearing is still the scattered husbandry of large numbers of farmers. Farmers have urgent requirements for raising three-way crossbreeding pigs, but little is known about the breeding techniques of this breed. The technical problems that farmers should pay attention to when raising three-way hybrid lean hogs are listed below for reference. 1. It is necessary to scientifically regulate the cultivars of the three-way hybrid lean type pigs to establish a scientific relationship between the blood associative relationship of the three-way hybrid lean type pigs, and have a great influence on daily gain, feed-to-weight ratio, slaughter rate, and lean meat percentage. Must be strictly managed. The bloodline of the parents must be clear and clear, and there must be specific signs and information for examination. At present, the ideal breed for peasant households is the combination of "two oceans and one soil" such as Changda Mei. Because the combination contains 25% local pig blood, the average daily gain can reach 648.67 grams, and the lean meat percentage is over 61%*. It also has better adaptability to the local climate and environment. Second, the choice of Miaozhu must be early growth and development of a good Miaozhu primary weight, weaning weight and late weight gain has a strong correlation. The sign of good growth and development of the Miao pigs is that they can reach 15-17.5 kg in weight on the 45th day. This shows that piglets have good growth and development during the fetal and lactation periods, and the daily growth and feed-to-weight ratios during the fattening period are ideal. If the age of a piglet cannot be known, it can be determined by observing the degree of sexual development of the piglet. If the piglet is between 20 and 25 kg, neither the boar's testis 9 nor the sow's vulva will germinate. This indicates that the piglet has a short growing age and good growth; otherwise, the growth is hindered; because the development of the pig's sexual organs is affected by The age of feeding has a large influence and is less affected by other factors. Third, the scientific and rational use of full-price fodder imperfect nutrition is the main factor that livestock can not achieve maximum production potential. The nutrients in feed also have direct and indirect effects on the body's immune function, and the variety of carcass (such as lean meat, meat flavor, etc.) is also directly affected by the feed variety. Therefore, in order to obtain the maximum production efficiency of the three-way hybrid lean hog, the full price of the feed is one of the key technical measures. At present, there are many full-priced feed brands, but the prices are higher. Based on self-produced agricultural and sideline products, farmers can mix different concentrations of concentrated premixed concentrates at various stages of growth to meet the needs of pig energy, protein and various micronutrients, and achieve the full-price feed copper feed effect. Fourth, technical measures to save feed costs In the direct cost of pig production, feed accounts for about 70%. How can we meet the nutritional requirements of the organism and reduce the cost of feeding? The following methods can be used in management: Multi-stage feeding. The growth process of the pig's body tissue is a continuous and gradual process, so the demand for various nutrient components is gradually occurring at various stages. To this end, the whole breeding of pigs can be divided into several stages, and the proportion of protein feeds that are relatively expensive, ie, concentrated premixes and basic materials, is adjusted once every 10 days, that is, the proportion of premixes is from 20% for every 10 days. By 1 percentage point, the basic material will increase by 1 percentage point every 10 days. The results of Sheng Linquan et al. (1977) compared with the three-stage feeding method (20-35 kg, 35-60 kg, 60-90 kg), the daily weight gain increased by 5.49%, the material consumption decreased by 2.86%, and each head increased economy. Income is 23.17 yuan. 2. Feed dry feed. Since many nutrients in feeds, especially vitamins, are easily destroyed and inactivated at high temperatures, raw feed should be preferred (except for legume feeds). Some nutrients will be lost in the water and some chemical changes will occur. Therefore, we must vigorously promote the dry feed technology for raw feeding. When the pig eats dry material, it can increase the number of chewing and promote the secretion of saliva, so that the digestive enzymes in the saliva can fully function. Improve feed utilization. 3. Limit feeding. Restricted feeding can improve feed utilization and carcass leanness. In general, the weight of pigs should not be restricted before 60 kg. Because of the strong growth and development of pigs in the early and mid-term, there is a large amount of nutrient requirements for feed, and the conversion rate of the feed to the body is also very good. If it is limited, it will affect the daily gain. After 60 kilograms, the development of the digestive organs of pigs has reached a perfect level, and the feed intake is large. Limiting feeding can achieve the goal of saving feed, reducing fat deposition and increasing lean meat percentage. The standard of feed restriction is generally 80%-85% of full food intake. 4. Timely slaughter. The growth and development of pigs is based on the law of the order of bones, fats and fats. The longer the pigs are fed or the greater the weight, the more fat is deposited, and the thicker the pigskin is, which will reduce the carcass leanness. In addition, the energy consumed by pigs to deposit fat is 9 times that of protein, so feeding "big pigs" will pay a huge feed cost. Three-way hybrid lean pigs generally weigh 70-90 kilograms. V. Doing a good job of raising the ecological environment and reducing stress response Due to the large proportion of blood outside the Sanyuan pig, the growth intensity is high, and the stress response to the environment is more intense, affecting the decline of growth and resistance, and even causing death. For example, if the appetite of pigs decreases in high temperature environment and the weight gain is slow, the low temperature will increase the nutrient consumption of the pigs, increase the density, noise, and air pollution, making it difficult for the pigs to be quiet, causing biting tails, biting ears, fighting and other aggressive behaviors. . Therefore, it is important to keep the pig house cool in winter, cool in summer, ventilated and breathable, and suitable in density so that the herds can be healthy. In addition, we must also do a good job of preventing epidemics, sealing and isolation, and regular disinfection to ensure the safety of the herd.
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